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In frogs, the number of pairs of cranial nerves arising from the brain are
Frog (Amphibian) = 10 Pairs; Amniotes (Humans/Reptiles/Birds) = 12 Pairs!
The nervous system of the frog (Rana tigrina) is organized into a central nervous system (brain and spinal cord), a peripheral nervous system (cranial and spinal nerves), and an autonomic nervous system (sympathetic and parasympathetic).
In anamniotes (fishes and amphibians including frogs), exactly 10 pairs of cranial nerves arise from the brain (Olfactory I, Optic II, Oculomotor III, Trochlear IV, Trigeminal V, Abducens VI, Facial VII, Auditory VIII, Glossopharyngeal IX, and Vagus X). The 11th (Accessory) and 12th (Hypoglossal) nerves are absent.
In amniotes (reptiles, birds, and mammals including humans), 12 pairs of cranial nerves are present. Candidates who mistakenly apply human anatomy will select 12, which is incorrect for frog.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Incorrect. Far below the actual count.
Incorrect. Does not represent any vertebrate cranial nerve baseline.
100% accurate. Canonical NCERT count of cranial nerve pairs in frog.
Incorrect. 12 pairs are found in amniotes (reptiles, birds, mammals/humans), not in amphibians.
Medical aspirants spend extensive time studying the 12 cranial nerves of humans. NTA specifically tests frog cranial nerves to check if students remember that amphibians have only 10 pairs.
"The peripheral nervous system of the frog comprises 10 pairs of cranial nerves and 10 pairs of spinal nerves."
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